Date   

Re: Cable types for 23cm

SAM JEWELL
 

I have first hand experience of FSJ4-50 screening breaking in a rotator loop. I admit it was probably too tight, but it took some finding as it wasn't always a significant 'open circuit'. Depending on where I was beaming, the match could vary significantly.
It certainly looks like we will need to be more careful with rotator loops than otherwise might have been the case!

73 de Sam, G4DDK


Sent from my DDKpad

On 14 Oct 2016, at 15:16, Conrad PA5Y g0ruz@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

No its just about flexi enough but considerably better than ecoflex 15. I think that we have to accept than anything with a turning loop will need replacing periodically, I'm sure that it's been said before but the traditional once a year springtime antenna maintenance just isn't enough.

Regards

Conrad PA5Y

On 14 October 2016 15:50:00 CEST, "mjniman@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

I bought a 100m reel of Ultraflex-13 from MLS a few weeks ago for VHF/UHF fixed antenna work 

Nice though it is I wouldnt say is very flexy....

 Murray G6JYB


Re: Cable types for 23cm

Stephen Tompsett
 

Don't allow Eco-flex, Westflex or other cables with similar foil screen to experience any twisting forces, it may lead to the foil tearing with no obvious external damage.

Specified minimum bend radius's for all cables are normally for one-time bends, arrange a spiral around rotators that minimises the bending of the cable but just tightens or loosens the spiral a bit with rotation.

TDR & swept frequency return loss measurements are useful to detect changes/deterioration in installations.


On 14/10/2016 11:14, ian ian@... [ukmicrowaves] wrote:
 
I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.
 
 
I think I will stick to the LMR400 I have for the short bit I need to do testing.
 
Ian
2E0IJH
 
Sent: Friday, October 14, 2016 at 10:48 AM
 

From: "Peter Torry peter.torry@... [ukmicrowaves]"
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Cable types for 23cm
 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 
On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:
 
What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 
 

 


-- 
Stephen Tompsett


Re: Cable types for 23cm

Conrad, PA5Y
 

No its just about flexi enough but considerably better than ecoflex 15. I think that we have to accept than anything with a turning loop will need replacing periodically, I'm sure that it's been said before but the traditional once a year springtime antenna maintenance just isn't enough.

Regards

Conrad PA5Y


On 14 October 2016 15:50:00 CEST, "mjniman@... [ukmicrowaves]" wrote:

I bought a 100m reel of Ultraflex-13 from MLS a few weeks ago for VHF/UHF fixed antenna work 

Nice though it is I wouldnt say is very flexy....

 Murray G6JYB


Re: Cable types for 23cm

John Quarmby
 

I use LMR400 equivalents from Gigatronix, their variant is LBC400. I use two runs of the standard version up the tower and the ExtraFlex version for the rotator loops for receive preamp outputs up to 13cm and the 2m/4m antenna feeder. For 23cm transmit I use Heliax in various forms, but it is a great deal heavier. The aluminium used in LBC400 keeps the cable weight down.

Gigatronix offer a cable make-up service, I used this with crimp plugs and they seem to be doing OK after over a year of use.

https://www.gigatronix.co.uk/

73

John G3XDY

On 14/10/2016 12:53, 'Tony Collett' anthony.collett@... [ukmicrowaves] wrote:


I am also intrigued having surmised my ECO15 (which doesn’t go round the rotator) has also suffered from constant raising/luffing my mast even though the bends incurred are not tight ones……

Conrad – your comment re the flexible dielectric coating of the foil is the same as ECO construction. Looking at the catalogue I can see little difference in the methods of construction that would suggest it would behave much different over time (other than better materials used??), so will watch with interest.

The alternative LMR has a bonded foil which is spirally wrapped so (may?) last longer if you can find a supplier of the Ultra Flex version??

Good luck

Tony

G4NBS

*From:*ukmicrowaves@... [mailto:ukmicrowaves@...]
*Sent:* Friday, October 14, 2016 13:16
*To:* ukmicrowaves@...
*Subject:* RE: [ukmicrowaves] Cable types for 23cm

Sam

Your findings will be of great interest !

This October, we too became a contest group to fall foul of Ecoflex degrading. Lots of 5m lengths, which we used “round the rotator”, or as matched feeds for stacked yagis, showed about 3 times the specified attenuation at any given frequency.

I gather that this topic has been covered before, but I’m a newcomer to the reflector. Being of an engineering background, I can see at least three issues :-

1.The outer foil cracks radially every 10 to 20mm. The accompanying braid only has about 70% coverage, so the Ecoflex begins to resemble “leaky feeder” which is actually designed to radiate.

2.Inner/outer migration. This leads to either the centre pin, or the braid/foil, eventually losing contact with the connector.

3.Cable tie indents – mentioned by coincidence in VHF-UHF this month, causing localised impedance changes. The likely solution here is to spend a bit more cash and buy the widest available ties so that the pressure is spread over a larger area.

These problems occurred to our Ecoflex, even though the rotator loops are fed through a corrugated plastic sleeve, affectionately known on site as the elephants trunk.

I don’t have any high quality gear to check out cables. But a summary of my findings is that the Heliax and Superflex which I have here measures per the specified loss, or a little better. I contrast, even brand new LMR and Eco cables fall short of the makers claims. Caveats apply !

Regards

John G4ZTR G0VHF/P M1CRO/P

*From:*ukmicrowaves@... [mailto:ukmicrowaves@...]
*Sent:* Friday, October 14, 2016 12:22
*To:* ukmicrowaves@...
*Subject:* Re: [ukmicrowaves] Cable types for 23cm

I shall be purchasing a length of that next week, together with the N connectors. After seeing it at EME2016, on their trade stand, I thought it was worth trying.

My plan is for 9cm, but depending on results it may go on another band. It will go on the HP net an before installing!

I may well install a length of it on the forthcoming 9cm EME installation as well. At least on transmit!

73 de Sam

< br>

------------------------------------------------------------------------

*From:*"g4bao john@... <mailto:john@...> [ukmicrowaves]" <ukmicrowaves@... <mailto:ukmicrowaves@...>>
*To:* "Ukmicrowaves (ukmicrowaves@... <mailto:ukmicrowaves@...>)" <ukmicrowaves@y ahoogroups.com <mailto:ukmicrowaves@y%20ahoogroups.com>>
*Sent:* Friday, 14 October 2016, 12:05
*Subject:* Re: [ukmicrowaves] Cable types for 23cm

I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73

John

On 14 October 2016 at 11:14, ian ian@... <mailto:ian@...> [ukmicrowaves] <ukmicrowaves@... <mailto:ukmicrowaves@...>> wrote:


I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.

I've found the link http://www.geekshed.co. uk/ecoflex-15-degradation/ <http://www.geekshed.co.uk/ecoflex-15-degradation/>

I think I will stick to the LMR400 I have for the short bit I need to do testing.

Ian

2E0IJH

*Sent:* Friday, October 14, 2016 at 10:48 AM


*From:* "Peter Torry peter.torry@... <mailto:peter.torry@...> [ukmicrowaves]" <ukmicrowaves@... <mailto:ukmicrowaves@...>>
*To:* ukmicrowaves@yahoogroups. com <mailto:ukmicrowaves@...>
*Subject:* Re: [ukmicrowaves] Cable types for 23cm

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others. I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately. A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

On 13/10/2016 20:29, ian ian@... <mailto:ian@...> [ukmicrowaves] wrote:

What cable types do people recomend for 23cm, I have in stock RG8
Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these
ok for a short run to yagi, 3m or so.

being testing transverter with short rg174 leads, need to make up
something to try out a bigger Yagi

Ian

2e0ijh




Re: Cable types for 23cm

mjniman@...
 


I bought a 100m reel of Ultraflex-13 from MLS a few weeks ago for VHF/UHF fixed antenna work 

Nice though it is I wouldnt say is very flexy....

 Murray G6JYB


Re: Cable types for 23cm

Paul G8AQA
 

I have been looking at the new Hyperflex 13/.500" made by M&P. This looks even better than the Ultraflex. I would have bought some at the Hamfest but MLS only had big reels. I just want it for the rotator bit as I have plenty of LDF4-50 for the unflexed bits.

I have not approaced MLS to see if they will sell by the metre.

Paul
G8AQA


Re: Cable types for 23cm

Tony G4NBS
 

I am also intrigued having surmised my ECO15 (which doesn’t go round the rotator) has also suffered from constant raising/luffing my mast even though the bends incurred are not tight ones……

 

Conrad – your comment re the flexible dielectric coating of the foil is the same as ECO construction. Looking at the catalogue I can see little difference in the methods of construction that would suggest it would behave much different over time (other than better materials used??), so will watch with interest.

 

The alternative LMR has a bonded foil which is spirally wrapped so (may?) last longer if you can find a supplier of the Ultra Flex version??

 

Good luck

Tony

G4NBS

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Friday, October 14, 2016 13:16
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Cable types for 23cm

 

 

Sam

 

Your findings will be of great interest !

 

This October, we too became a contest group to fall foul of Ecoflex degrading. Lots of 5m lengths, which we used “round the rotator”, or as matched feeds for stacked yagis, showed about 3 times the specified attenuation at any given frequency.

 

I gather that this topic has been covered before, but I’m a newcomer to the reflector. Being of an engineering background, I can see at least three issues :-

 

1.       The outer foil cracks radially every 10 to 20mm. The accompanying braid only has about 70% coverage, so the Ecoflex begins to resemble “leaky feeder” which is actually designed to radiate.

2.       Inner/outer migration. This leads to either the centre pin, or the braid/foil, eventually losing contact with the connector.

3.       Cable tie indents – mentioned by coincidence in VHF-UHF this month, causing localised impedance changes. The likely solution here is to spend a bit more cash and buy the widest available ties so that the pressure is spread over a larger area.

 

These problems occurred to our Ecoflex, even though the rotator loops are fed through a corrugated plastic sleeve, affectionately known on site as the elephants trunk.

 

I don’t have any high quality gear to check out cables. But a summary of my findings is that the Heliax and Superflex which I have here measures per the specified loss, or a little better. I contrast, even brand new LMR and Eco cables fall short of the makers claims. Caveats apply !

 

Regards

 

John G4ZTR G0VHF/P M1CRO/P

 

 

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Friday, October 14, 2016 12:22
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

I shall be purchasing a length of that next week, together with the N connectors. After seeing it at EME2016, on their trade stand, I thought it was worth trying.

My plan is for 9cm, but depending on results it may go on another band. It will go on the HP net an before installing!

I may well install a length of it on the forthcoming 9cm EME installation as well. At least on transmit!

 

73 de Sam

 

 

< br>

 


From: "g4bao john@... [ukmicrowaves]" <ukmicrowaves@...>
To: "Ukmicrowaves (ukmicrowaves@...)" <ukmicrowaves@y ahoogroups.com>
Sent: Friday, 14 October 2016, 12:05
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73

John

 

On 14 October 2016 at 11:14, ian ian@... [ukmicrowaves] <ukmicrowaves@...> wrote:


 

I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.

 

 

I think I will stick to the LMR400 I have for the short bit I need to do testing.

 

Ian

2E0IJH

 

Sent: Friday, October 14, 2016 at 10:48 AM

 


From: "Peter Torry peter.torry@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@yahoogroups. com
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 

On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:

 

What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.

 

being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi

 

Ian

2e0ijh

 

 

 

 

 

 


Re: Cable types for 23cm

ian hope (2E0IJH)
 

Just to add with contest cables we had lot of cable migration with Westflex cables that had been stored coiled, centre pins losing contact loose plugs, ended up using crimp plugs, which seams to have stopped the problem.
 
Cable ties, have you tried these? http://www.cablecraft.co.uk/200mm-velcro-cable-tie-pack-25.html?gclid=CLS22Z-p2s8CFRITGwodTbEHjA
 
Ian
2E0IJH

 
Sent: Friday, October 14, 2016 at 1:16 PM
From: "'John Lemay' john@... [ukmicrowaves]"
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Cable types for 23cm
 

 

Sam

 

Your findings will be of great interest !

 

This October, we too became a contest group to fall foul of Ecoflex degrading. Lots of 5m lengths, which we used “round the rotator”, or as matched feeds for stacked yagis, showed about 3 times the specified attenuation at any given frequency.

 

I gather that this topic has been covered before, but I’m a newcomer to the reflector. Being of an engineering background, I can see at least three issues :-

 

1.       The outer foil cracks radially every 10 to 20mm. The accompanying braid only has about 70% coverage, so the Ecoflex begins to resemble “leaky feeder” which is actually designed to radiate.

2.       Inner/outer migration. This leads to either the centre pin, or the braid/foil, eventually losing contact with the connector.

3.       Cable tie indents – mentioned by coincidence in VHF-UHF this month, causing localised impedance changes. The likely solution here is to spend a bit more cash and buy the widest available ties so that the pressure is spread over a larger area.

 

These problems occurred to our Ecoflex, even though the rotator loops are fed through a corrugated plastic sleeve, affectionately known on site as the elephants trunk.

 

I don’t have any high quality gear to check out cables. But a summary of my findings is that the Heliax and Superflex which I have here measures per the specified loss, or a little better. I contrast, even brand new LMR and Eco cables fall short of the makers claims. Caveats apply !

 

Regards

 

John G4ZTR G0VHF/P M1CRO/P

 

 

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Friday, October 14, 2016 12:22
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

I shall be purchasing a length of that next week, together with the N connectors. After seeing it at EME2016, on their trade stand, I thought it was worth trying.

My plan is for 9cm, but depending on results it may go on another band. It will go on the HP net an before installing!

I may well install a length of it on the forthcoming 9cm EME installation as well. At least on transmit!

 

73 de Sam

 

 

< br>

 


From: "g4bao john@... [ukmicrowaves]" <ukmicrowaves@...>
To: "Ukmicrowaves (ukmicrowaves@...)" <ukmicrowaves@y ahoogroups.com>
Sent: Friday, 14 October 2016, 12:05
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73

John

 

On 14 October 2016 at 11:14, ian ian@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

 

I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.

 

 

I think I will stick to the LMR400 I have for the short bit I need to do testing.

 

Ian

2E0IJH

 

Sent: Friday, October 14, 2016 at 10:48 AM

 


From: "Peter Torry peter.torry@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@yahoogroups. com
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 

On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:

 

What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.

 

being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi

 

Ian

2e0ijh

 

 

 

 

 

 

 

 


Re: Cable types for 23cm

John Lemay
 

Sam

 

Your findings will be of great interest !

 

This October, we too became a contest group to fall foul of Ecoflex degrading. Lots of 5m lengths, which we used “round the rotator”, or as matched feeds for stacked yagis, showed about 3 times the specified attenuation at any given frequency.

 

I gather that this topic has been covered before, but I’m a newcomer to the reflector. Being of an engineering background, I can see at least three issues :-

 

1.       The outer foil cracks radially every 10 to 20mm. The accompanying braid only has about 70% coverage, so the Ecoflex begins to resemble “leaky feeder” which is actually designed to radiate.

2.       Inner/outer migration. This leads to either the centre pin, or the braid/foil, eventually losing contact with the connector.

3.       Cable tie indents – mentioned by coincidence in VHF-UHF this month, causing localised impedance changes. The likely solution here is to spend a bit more cash and buy the widest available ties so that the pressure is spread over a larger area.

 

These problems occurred to our Ecoflex, even though the rotator loops are fed through a corrugated plastic sleeve, affectionately known on site as the elephants trunk.

 

I don’t have any high quality gear to check out cables. But a summary of my findings is that the Heliax and Superflex which I have here measures per the specified loss, or a little better. I contrast, even brand new LMR and Eco cables fall short of the makers claims. Caveats apply !

 

Regards

 

John G4ZTR G0VHF/P M1CRO/P

 

 

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Friday, October 14, 2016 12:22
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

I shall be purchasing a length of that next week, together with the N connectors. After seeing it at EME2016, on their trade stand, I thought it was worth trying.

My plan is for 9cm, but depending on results it may go on another band. It will go on the HP net an before installing!

I may well install a length of it on the forthcoming 9cm EME installation as well. At least on transmit!

 

73 de Sam

 

 

< br>

 


From: "g4bao john@... [ukmicrowaves]" <ukmicrowaves@...>
To: "Ukmicrowaves (ukmicrowaves@...)" <ukmicrowaves@y ahoogroups.com>
Sent: Friday, 14 October 2016, 12:05
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73

John

 

On 14 October 2016 at 11:14, ian ian@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.

 

 

I think I will stick to the LMR400 I have for the short bit I need to do testing.

 

Ian

2E0IJH

 

Sent: Friday, October 14, 2016 at 10:48 AM

 


From: "Peter Torry peter.torry@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@yahoogroups. com
Subject: Re: [ukmicrowaves] Cable types for 23cm

 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 

On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:

 

What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.

 

being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi

 

Ian

2e0ijh

 

 

 

 

 

 


Re: Cable types for 23cm

Conrad, PA5Y
 

I have been using this coax in a single run for 10 months on 2m and 70cms. I am very active and rotate my tropo antennas a lot! I tried the M & P ultraflexx 13 because my ecoflex 15 turning loop went lossy after only 4 months. I am just about to come on 23cms and will use it to go up the mast and for the turning loop to the dish. I have a 13m piece of LDF5-50A to the base of the mast.

The foil has a thin flexible dielectric film coating to prevent cracking. I know that 10 months is not long but the Ecoflex 15 failed after only 4 months so I have confidence in the M&P product.
There are no 7/16 connectors for it that I'm aware of which is giving me a headache on 23cms as all my Heliax has 7/16 connectors.

Regards

Conrad PA5Y


On 14 October 2016 13:05:16 CEST, "g4bao john@... [ukmicrowaves]" wrote:
I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73
John

On 14 October 2016 at 11:14, ian ian@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.
 
 
I think I will stick to the LMR400 I have for the short bit I need to do testing.
 
Ian
2E0IJH
 
Sent: Friday, October 14, 2016 at 10:48 AM
 

From: "Peter Torry peter.torry@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@yahoogroups.com
Subject: Re: [ukmicrowaves] Cable types for 23cm
 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 
On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:
 
What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 
 

 



Re: Cable types for 23cm

SAM JEWELL
 

I shall be purchasing a length of that next week, together with the N connectors. After seeing it at EME2016, on their trade stand, I thought it was worth trying.
My plan is for 9cm, but depending on results it may go on another band. It will go on the HP net an before installing!
I may well install a length of it on the forthcoming 9cm EME installation as well. At least on transmit!

73 de Sam






From: "g4bao john@... [ukmicrowaves]"
To: "Ukmicrowaves (ukmicrowaves@...)"
Sent: Friday, 14 October 2016, 12:05
Subject: Re: [ukmicrowaves] Cable types for 23cm

 
I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73
John

On 14 October 2016 at 11:14, ian ian@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 
I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.
 
 
I think I will stick to the LMR400 I have for the short bit I need to do testing.
 
Ian
2E0IJH
 
Sent: Friday, October 14, 2016 at 10:48 AM
 

From: "Peter Torry peter.torry@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@yahoogroups. com
Subject: Re: [ukmicrowaves] Cable types for 23cm
 
 
Hi Ian,
Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.
In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.
73
Peter
G3SMT
 
On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:
 
What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 
 
 




Re: Cable types for 23cm

g4bao
 

I'd go for the new M&P ultraflex 13 stuff from Italy stocked by MLS.

They look to have tried to tackle this issue of foil breakage and the spec is really good.

73
John

On 14 October 2016 at 11:14, ian ian@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.
 
 
I think I will stick to the LMR400 I have for the short bit I need to do testing.
 
Ian
2E0IJH
 
Sent: Friday, October 14, 2016 at 10:48 AM
 

From: "Peter Torry peter.torry@... [ukmicrowaves]" <ukmicrowaves@...>
To: ukmicrowaves@yahoogroups.com
Subject: Re: [ukmicrowaves] Cable types for 23cm
 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 
On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:
 
What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 
 

 



Re: Cable types for 23cm

ian hope (2E0IJH)
 

I've steered clear of Ecoflex as we had several lengths of the stuff break down, that were contest cables. I believe there was a write up someone of a another contest group having similar issues.
 
I've found the link http://www.geekshed.co.uk/ecoflex-15-degradation/
 
I think I will stick to the LMR400 I have for the short bit I need to do testing.
 
Ian
2E0IJH
 
Sent: Friday, October 14, 2016 at 10:48 AM
 

From: "Peter Torry peter.torry@... [ukmicrowaves]"
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Cable types for 23cm
 

 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT

 
On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:
 
What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 
 

 


Re: Cable types for 23cm

Peter G3SMT
 

Hi Ian,

Of the coax types that you have available I would use the LMR400 and neither of the others.  I use 0.5 inch hardline (eg LDF4-50 etc) to the mast mounted LNA and the Ecoflex 15 around the rotator to the aerial.

In choosing a type of cable its best to review the overall system NF required and dimension the components appropriately.  A good start would be Ecoflex 15 as one run from aerial to equipment or if a long run and for portable use Ecoflex15+ as it is much lighter in weight.

73

Peter

G3SMT


On 13/10/2016 20:29, ian ian@... [ukmicrowaves] wrote:
 
What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 


Re: Elevation

Dave <g4rqi@...>
 

Hello..

Thank you to everyone who has replied on and off list I now have an idea where to start

73 David

On 12-Oct-16 10:48 PM, Doug Parker doug.parker@... [ukmicrowaves] wrote:
Hi,

For the past twenty years I've used a SuperJack 24 inch for the elevation on my ten foot dish.

I've just built and commissioned a K3NG Arduino controller that takes various position sensors.

For the K3NG see https://blog.radioartisan.com/yaesu-rotator-computer-serial-interface/

73s
Doug
G4DZU

Sent from my iPad

On 12 Oct 2016, at 19:32, Dave G4RGK zen70432@... [ukmicrowaves] <ukmicrowaves@...> wrote:

I use a Dynastar ds-21 on the yagis and Jaeger 18" on the dish. Both
second hand bought at rallies, make sure you mount the right way or they
fill with water.

73 Dave G4RGK

On 12/10/2016 16:04, Dave g4rqi@... [ukmicrowaves] wrote:
Hello

Do any of you use an actuator for elevation on eme and if so is there a
model and interface you would recommend or is everyone using SPID's?

73 David



------------------------------------
Posted by: Dave <g4rqi@...>
------------------------------------


------------------------------------

Yahoo Groups Links




Cable types for 23cm

ian hope (2E0IJH)
 

What cable types do people recomend for 23cm, I have in stock RG8 Foam (belden 9913), Westflex 103, and some Lmr 400, Any of these ok for a short run to yagi, 3m or so.
 
being testing transverter with short rg174 leads, need to make up something to try out a bigger Yagi
 
Ian
2e0ijh
 
 


Re: JT65C

Andy G4JNT
 

Of course ...
If you want to practice JT65C decoding when there's no one to vurk ...

Point at G8MBU on the Isle of Wight, 1296.800MHz (tune 1296.799 ish for WSJT-X)

'jnt


On 12 October 2016 at 22:22, g4bao john@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

I enjoyed the couple of hours as well, but my under-rated directional coupler didn't enjoy 400Watts up it.

See my twitter feed @g4bao for pictures. 

Smokin! 


73
John

On 12 October 2016 at 21:28, Sam Jewell jewell@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

An enjoyable hour or so working G4BAO and G4DBN on 23cm JT65C. Failed with GM8IEM.
At times WSJT-X JT65C failed to decode with aircraft doppler present. Also my transmitter would occasionally cut off when a 'meep' was received?
When it worked, it worked well!
Mainly dropped back to WSJT10
Prerelease candidate WSJT-X seems to have a few bugs when used in my set up that I don't see with WSJT10. I guess when it is finally released these problems will have gone away...........
Sam, G4DDK

Sent tomorrow from my time machine




Re: JT65C

Tim Hague M0AFJ
 

I was active last night, got lots of AS bursts but no actual decodes. My amp is not properly set up yet, only had about 30W and also lack of experience in these digital modes.
Over the weekend I'll raise the power to around 80W and look on KST for a sked.

Best Regards
Tim Hague


On 13 Oct 2016, at 08:05, 'Martin A Hall' gorrell77@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

Yesterday evening provided a good opportunity to participate in JT65C tests on 1296.165 MHz.  Thanks to John G4BAO, Sam G4DDK and Neil G4DBN for trying with me, even though nothing was heard at either end on this occasion, and to those who listened in.  These are difficult paths, especially since my horizon at a QTF of 150 degrees (+/-) is at ~3 degrees due to local hills; I believe some propagation enhancement will be necessary for future success.
 
Of those mentioned, only Neil G4DBM is close enough (572 km) to have a significant common volume for aircraft scatter, and we plan to try again when there are more aircraft about, probably using ISCAT and/or SSB.
 
In the past I’ve had successful 23cm QSOs with Tony G4CBW under flat conditions, at a range of  605km using JT4G, ISCAT, CW and SSB, though we haven’t yet tried JT65C or QRA64.
 
Last night I was using WSJT 10, although I have a copy of WSJT-X v1.7 which I’ll load on to the PC that drives the 70cm and 23cm systems for use in the future.
 
If anyone would like a daytime test, please e-mail for a sked or meep if you see me on KST.  Aircraft scatter QSOs as far south as Yorkshire should be possible without too much difficulty if you have a reasonable take-off my way.
 
73,
Martin
GM8IEM – IO78HF
 
 


Re: JT65C

Mark
 

I could copy John almost every period and also decoded signals from Sam. John was -6 at his strongest with me.

 

I tried both WSJT-X 1.7 and WSJT10 - my observations were that when I had two signals from the same station with one a few Hz away from the other on the waterfall - perhaps via different paths or even AS - WSJT-X failed to decode but WSJT10 was successful.

 

I’m going to finish my 150W linear project and get more power at this end and hope to try again then.

 

I’m very new to these frequencies so found it somewhat amazing I could hear anything at all!

 

Mark

G0MGX

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 13 October 2016 08:05
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] JT65C

 

 

Yesterday evening provided a good opportunity to participate in JT65C tests on 1296.165 MHz.  Thanks to John G4BAO, Sam G4DDK and Neil G4DBN for trying with me, even though nothing was heard at either end on this occasion, and to those who listened in.  These are difficult paths, especially since my horizon at a QTF of 150 degrees (+/-) is at ~3 degrees due to local hills; I believe some propagation enhancement will be necessary for future success.

 

Of those mentioned, only Neil G4DBM is close enough (572 km) to have a significant common volume for aircraft scatter, and we plan to try again when there are more aircraft about, probably using ISCAT and/or SSB.

 

In the past I’ve had successful 23cm QSOs with Tony G4CBW under flat conditions, at a range of  605km using JT4G, ISCAT, CW and SSB, though we haven’t yet tried JT65C or QRA64.

 

Last night I was using WSJT 10, although I have a copy of WSJT-X v1.7 which I’ll load on to the PC that drives the 70cm and 23cm systems for use in the future.

 

If anyone would like a daytime test, please e-mail for a sked or meep if you see me on KST.  Aircraft scatter QSOs as far south as Yorkshire should be possible without too much difficulty if you have a reasonable take-off my way.

 

73,

Martin

GM8IEM – IO78HF

 

 


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Re: JT65C

Martin A Hall <gorrell77@...>
 

Yesterday evening provided a good opportunity to participate in JT65C tests on 1296.165 MHz.  Thanks to John G4BAO, Sam G4DDK and Neil G4DBN for trying with me, even though nothing was heard at either end on this occasion, and to those who listened in.  These are difficult paths, especially since my horizon at a QTF of 150 degrees (+/-) is at ~3 degrees due to local hills; I believe some propagation enhancement will be necessary for future success.
 
Of those mentioned, only Neil G4DBM is close enough (572 km) to have a significant common volume for aircraft scatter, and we plan to try again when there are more aircraft about, probably using ISCAT and/or SSB.
 
In the past I’ve had successful 23cm QSOs with Tony G4CBW under flat conditions, at a range of  605km using JT4G, ISCAT, CW and SSB, though we haven’t yet tried JT65C or QRA64.
 
Last night I was using WSJT 10, although I have a copy of WSJT-X v1.7 which I’ll load on to the PC that drives the 70cm and 23cm systems for use in the future.
 
If anyone would like a daytime test, please e-mail for a sked or meep if you see me on KST.  Aircraft scatter QSOs as far south as Yorkshire should be possible without too much difficulty if you have a reasonable take-off my way.
 
73,
Martin
GM8IEM – IO78HF